package com.best.Lock;

import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;

/**
 * @author Jiang Akang
 * employeeId: BG435424
 * @date 2020/12/8
 **/
class ShareResource {
    private int number = 1; //A:1 B:2 C:3
    private Lock lock = new ReentrantLock();
    private Condition c1 = lock.newCondition();
    private Condition c2 = lock.newCondition();
    private Condition c3 = lock.newCondition();
    public void  print5() {
        lock.lock();
        try {
            //1 判断
            while (number != 1) {
                c1.await();
            }
            //2 干活
            for (int i=1; i<=5; i++) {
                System.out.println(Thread.currentThread().getName() + "\t" + i);
            }
            //3 通知
            number = 2;
            c2.signal();
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            lock.unlock();
        }
    }
    public void  print10() {
        lock.lock();
        try {
            //1 判断
            while (number != 2) {
                c2.await();
            }
            //2 干活
            for (int i=1; i<=10; i++) {
                System.out.println(Thread.currentThread().getName() + "\t" + i);
            }
            //3 通知
            number = 3;
            c3.signal();
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            lock.unlock();
        }
    }
    public void  print15() {
        lock.lock();
        try {
            //1 判断
            while (number != 3) {
                c2.await();
            }
            //2 干活
            for (int i=1; i<=15; i++) {
                System.out.println(Thread.currentThread().getName() + "\t" + i);
            }
            //3 通知
            number = 1;
            c1.signal();
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            lock.unlock();
        }
    }
}

/**
 * 题目：多线程之间按顺序调用，实现A->B->C三个线程启动，要求如下：
 * A打印5次，B打印10次，C打印15次
 * 紧急着
 * A打印5次，B打印10次，C打印15次
 * ...
 * 来10轮
 */
public class SyncAndReentrantLockDemo {
    public static void main(String[] args) {
        ShareResource shareResource = new ShareResource();
        new Thread(() -> {
            for (int i=1; i<=10; i++) {
                shareResource.print5();
            }
        }, "A").start();
        new Thread(() -> {
            for (int i=1; i<=10; i++) {
                shareResource.print10();
            }
        }, "B").start();
        new Thread(() -> {
            for (int i=1; i<=10; i++) {
                shareResource.print15();
            }
        }, "C").start();
    }
}
